Error code

OBD2 P2121

OBD2P2121
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Throttle/Pedal Position Sensor/Switch 'D' Circuit Range/Performance.

Severity

moderateCan drive but may experience performance issues. It's recommended to address the issue soon.

Summary

Code P2121 indicates a range or performance issue with the throttle position sensor/switch 'D' in the drive-by-wire system of your vehicle.

Symptoms

  • Check engine light is on
  • Engine may run rough or stall

Common Causes

  • Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors between sensors
  • Defective throttle position sensor/switch 'D'
  • Failed or failing PCM (rare)

Diagnosis

  1. Inspect and test wiring between sensors and PCM for damage or corrosion.
  2. Check throttle position sensor/switch 'D' for proper operation.
  3. Verify that the accelerator pedal position switch is functioning correctly.

Fixes

  • Replace faulty throttle position sensor/switch 'D'.

FAQ

What does code P2121 mean?

It indicates a range or performance issue with the throttle position sensor/switch 'D' in your vehicle's drive-by-wire system.

How do I diagnose this problem?

Inspect and test wiring between sensors, check the throttle position sensor/switch 'D', and verify the accelerator pedal position switch for proper operation.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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